How To Open Bonnet On Mercedes A Class 2021

While non all Mercedes-benz prior to 2010 models have active bonnet feature installed equally standard equipment, the models in early on 2010 has got this feature as optional; making it a standard equipment in all newer vehicle models such as South-Course W222. Purpose of designing and installing this feature in all newer models is to amend pedestrian protection while your Mercedes benz is on the road and involved in an blow, or faced an emergency braking state of affairs, or you hitting a pit or pothole on the road. Your Mercedes-benz typically displays a "active bonnet malfunction run into possessor's manual" warning bulletin on the dashboard in an effect of collision to mitigate injury to pedestrians or roadrunners should you hitting i.

What does active bonnet malfunction means?

active hood malfunction, see owner's manual

When you collide on the road, with a huge bang, the rear edge of the hood nigh the windshield would lift up to 2 inches to ensure pedestrian safety and even if yous volition put information technology dorsum in place, the message maxim "active hood malfunction, see owner'south manual" will still appear. Active bonnet organisation helps to create an additional space between the hood and the engine for improved roadrunners protection and when closing the hood doesn't disappear the display of bulletin, nosotros call it active bonnet malfunction. You may simply close the hood by following piece of cake steps every bit mentioned in owner's transmission:

Keep your hands flat and printing the both sides of active bonnet at the rear where bonnet hinges are found
Press down until you hear an audible click

How to reset Mercedes active hood?

If the active hood alarm bulletin was triggered and didn't disappear later on closing the hood, it is possible that the replacement of Mercedes actuator will serve the resetting purpose. But the replacement of any office should be left to the last option. A proper diagnosis of fault codes related to active bonnet actuators using a mercedes benz scanner is recommended before replacement. You tin can use Mercedes benz specific scanners such as

Foxwell for Benz,
iCarsoft for Mercedes, and
Autel Professional scanner to read and articulate the error codes.

What causes agile hood malfunction?

Primarily, SRS/ Airbag module and accelerator sensors installed at the front end of your Mercedes benz activates and controls the agile bonnet feature. Your Mercedes-benz driver side has a hood latch, actuator and micro switch while the passenger side has a simple latch and release mechanism. Damage acquired to any function of these two controlling apparatus may event in active hood malfunctioning. These damaged parts could exist hood actuators, sensors, hood latch or SRS module itself.

Hood actuators

After an blow, the problem identified as most common is the damaged hood actuator which triggers the Agile Hood Malfunctions Run into Possessor's Manual mistake bulletin. Luckily, this mutual problem has got a very common solution equally well – Replacement. You can replace the faulty or damaged hood actuators with the new ones and depending on the event; you might be required to clear the codes from SRS module as well.

Acceleration Sensors

There are affect sensors behind bumper, which should exist connected and working too, for agile bonnet. If your Mercedes benz hood is properly closed and neither the vehicle is collided anywhere but even so your dashboard is displaying a Active Hood Malfunctions See Owner'south Transmission message then it is possible that these two dispatch sensors residing in the bumper may exist damaged or disconnected.

Hood latch

Hood latch and micro switch doesn't contribute much to this malfunctioning but aye, If the latch gets bent or misaligned during or after an blow, information technology may forestall the switch from operating correctly.

SRS Module

If the hood is closed and the airbag calorie-free is on, active hood malfunction message may still appear considering of following reasons:

the wire harness to the hood actuator,
the hood actuator has previously deployed
the airbag module has been unlocked with a professional diagnostic during diagnostics.

In all that cases, replacement of bonnet actuators and immigration fault codes from SRS module is recommended. Notwithstanding, y'all will need Mercedes benz specific scanners to further read on and clearing error codes related to active hood system.

Some mercedes-benz part numbers of hood actuator